Rich, lightly sweetened cream biscuits top a luscious filling of fresh blueberries in one of Martha's favorite desserts. The filling is made with fresh berries, cornstarch, lemon juice, and a hint of cinnamon for a summer dessert bursting with flavor.
The amount of sugar and cornstarch needed will depend on the sweetness and ripeness of the fruit. Taste the berries. If they are sour, add an extra 1/4 cup sugar in step 2. If juicy, add an extra 1 teaspoon cornstarch. To catch any juices that may bubble over when baking, place the baking dish on a rimmed baking sheet or lay a piece of foil on the rack below the cobbler.